So I'm like way late to this party, but I thought I'd share anyway because I don't blog as often as I'd like these days because it's spring and the daffodils are blooming in the median strips and the sun shines just a little later in the day and because reasons.
vSphere Update Manager is awesome, let it be known. And you should spend more time looking at it, specifically the Admin View, because there is more to life than Compliance. And if you spend time looking at the Admin View, why not click over to the Configuration tab, and select Download Settings. Maybe, just maybe, you'll see something like this:
I've highlighted the interesting part. In this case, the Download Source for HP VIBs (that is, software bundles that are specific to your HP physical hosts) shows a Connectivity Status of "Not Connected." Oh, and bad news: it's been that way for a while now. Why? Because of the HP / HPE split that happened last fall. The fix is easy enough: just edit the Download Source and replace hp.com with hpe.com (and while you're at it, why not enable HTTP/S? Use https://vibsdepot.hpe.com/index.xml). Validate that URL, and you're back in the realm of the Connected.
Of course, the admins behind the old URL tried to tell you about the new URL, they just chose a really arcane method for doing it. Look carefully at the URL in the first screenshot: it's http://vibsdepot.hp.com//index.xml. Two slashes, yes. Go ahead and bring that up in a browser window.
Connected again, you may go forth and patch. Happy updating, intrepid vSphere administrator.